SYLVANIA - D2R Basic HID (High Intensity Discharge) Headlight Bulb - High Performance Bright, White, and Durable Lamp (Contains 1 Bulb)Lights Dim Over Time, Replace In Pairs: Your lights are a pair, one is never turned on without the other. If one bulb burns out, the other isn't far behind. Replace your D2R HID bulbs in pairs for optimum performance.Extremely Long Life: D2R HIDs have a longer life, using 1/3 less energy compared to normal halogen lighting.Superior Visibility: D2R HIDs output 3 times more light than a normal halogen bulb. The bulb is legal for road use.The Sylvania Standard Of Quality: With over 100 years in business, Sylvania is the world leader in automotive lighting for Original Equipment Manufacturers (OEMs) and the aftermarket.